Liner plate for jaw crushers



A. J. ROUBAL LINER PLATE FOR JAW CRUSHERS Nov. 9, 1948.

Filed June 9, 1944 m a ||A4 Y 1 A I. I. I QQIQI ZI Z V/fi 474, 2 tar/4 g /22 7/ 7 74. a 4 I 2 Patented Nov. 9, 1948 V UNITEDSTATE I LINER PLATE FOR JAW o Usn Rs AlexanderJ. Rouba l, MilwaukeeQWis assignor j to Allis-Chalmers Manufacturing Company, Milwaukee, Wis., a. corporation of Delaware,

' Application June 9, 1944, Serial No; 53!);436

4 Claims. (01. 24 1300) This invention concerns an improvement in jaw crusher jaw structure in which a crusher jaw body is provided with a detachable wear plate forming a supportingseat formounting a detachable jaw liner plate. I l i It has been long known to provide replaceable liner platesor jaw plates detachably mounted on thejaw body structure of jawcrushers. In order to 'guard against wear of theseat for the jaw platoon the jaw body proper, it has been customary toprovide abutments positively fixing the position of the jaw plates on the jaw in addition tothe holding bolts securing the jaw plate to the body. Difliculty has been experienced with some arrangements due to the tendency of. the hard tough jaw plate to expand laterally under the pounding and crushing action of the stone or other material being crushed. Such expansion has strained the jaw body structure and the abut-j ments used to fix the plate on the body, sometimes causing breakage of the jaw body structure where the jaw plate was rigidly confined withoutprovision for expansion. Furthermorethejaw plates sometimes became loosened so that relative motion with respect to the jaw structurecaused wear on the seat for the "jaw plate so that when. an old plate wasreplaced by a new one the new plate could not be firmly secured to the jaw structure because of irregularityof the jaw plate seati.

An object of this invention is to provide an improved crusher jawin which the jaw plate or liner is rigidly supported at one point and free to expand in service without damage to the supporting structure. i

Another object is to' provide a crusher jaw structurehaving a renewable wear plate forming a jaw plate or liner supporting abutment and wearing surface for the body of the jaw. it l The present invention having the above and furtherobject-s which may appear herein may best be carried intopractical effect as fully dee scribed herein in connection with ing drawing, in which: r r

Fig. 1 is a vertical cross sectional view through: a jaw type crusher embodying the present invention; and

the accompanyactuated byrnechanism Fig.2 is a fragmentary elevation on the plane II-II of Fig. l, with the" hook removed.

The crusher illustrated in Fig. l is an ordinary jaw type crusher having the working faces of the jaws equipped accordingto the present invention. The frame of the crusher is shown at -l and has a: s ati na jaw ed? 2 A n i l dy 3 is pivoted to the frame; I at 4 and has a crushing movement imparted to it by a crusher toggle fi 5: formed in s'uch a mannerthat in additionto the well known inthea-rt and forming no; part of the present invention y The swinging jaw 3 is provided with a pressure receiving face 1 and maybe provided atits lower endor toe with .a step 8 forming an abutment running transverselyacross the face of. the jaw, body. One or! more wear plates aredetachably mounted in pressure transmitting relation. on-the face. 1 of the swinging jaw. The lower edge'of at least one of these wear plates. ll may-rest against the step 8 of the toe of the swinging jaw 3. The wear plates ll aresecurely attached r to the face I of the swinging jaw 3 asby bolts I2. The outer surface ofthc wear plates H whenattac-hed to the swinging jawbody 3, forms arflatmounting surface or seat for the'jawliner, formedof liner plates 63, which forms the working surface of the swinging jaw. r r

In the crusher illustratedin the drawing, there are shown a pair oi flatswear plates H spaced longitudinally of the jaw body 3 forming an interrupted seat for; the jaw. liner, the space between the. Wearplates lLiorming a groove across; the said seat. .As'shown, the jaw liner is madeyup of. a pair of: separate liner plates 13 on swinging jaw 3, eachhaving a working face (4 andaplane rear face 16 which is machined to fit the seat formed .by wear plates ll. Linerplatesl3 may.

be securely fastened in position on themoving jaw by bolts l 'l passinguthrough theplates and [the jaw body 3 and. having rectangular tapered heads [8 countersunk inthe workingiface of the:

linerplates insuitablerecesses [9. In the body of the liner plates, adjoining the holes through,

which bolts I? pass, a tapered recess 2| may bc bolt 'holeswthere' will be an intersecting recess extendingxthrough the liner plates l3 from the) workingfaice I 4' toward the rear face t6 dnsthe directionof one endof :theplate; for a .purpos to be rmore fully :describedhereinafter;

"The: working face of the stationaryjawbody 2 isxformed in a manner similar to that of the swinging jaw 3,fiat wear plates .22 and 23yare shown secured to the. face 9 of the stationary body 2 at the upper and lower ends thereof, re-

spectively, as by'bolts 24.' Wear plates 22 and 23 former pressure receiving seat for the jaw liner,

shown as madeup of liner plates 26 and 21 which form the 'working surface of thestationary jaw. Jaw liner plates 26 and 21 are secured in position on the stationary jaw by bolts IT inuamanner similar "tothatin whichthe moving jaw liner;

plates I3 re secured."

t amend of thejplane rear face 16 ofeach the drawing, the jaw liner is formed as a pair of liner plates mounted on each jaw of the crusher with the ledges 28 in abutting relation at about the central portion of the jaw, substantially filling the space between the wear plates I l on the swinging jaw and the wear plates 22 and 23 on the stationary jaw. It will be understood, how-y ever, that the invention can be applied in crushers having only one liner plate on each jaw; that is by placing the ledge 28 at one end only of each liner plate and using only a singlewear plate in a manner which can be clearly visualized by a consideration of the lower half only of the jaws of the crusher shown in the drawing. Furthermore, a single integral liner plate could be used having asingle ledge running across its plane rear face intermediate the ends, such as would be achieved ifthe separate liner plates l3 as shown on the swinging jaw 3 in the drawing were formed integrally as one liner plate.

G It has been found that in the operation of the jaw type crushers having liner plates formed of manganese steel, the crushing impact of the rock on the surface of the liner plate causes the liner plate to expand laterally by cold working action. This expansion is more marked directly at the working surface and results ina warping of the plate so that it becomes more or less convex in service. If the ends of the liner plate are confined between fixed abutments on the jaw body. the expansion of the plate in service will cause a tremendous strain on the abutment, and has been'known to cause breaking off of the fixed shoulders or abutments between which it is confined. 1 The present arrangement permits the linerplates to be'fixed at one portion only of their length with relation to the jaw body, and leaves the plate unconfined and free to expand laterally in all directions without throwing any strain on any part of the jawbody. The warpingof the liner plate mentioned hereinabove causes stretching of the bolts which hold the liner plate in the jaw body, and frequently results in a loosening of the liner plate so that, under crushing pressure, it moves around relative to the seat or mounting surface prepared for it on the jaw. 'body, causing irregular wear of the mountin'g surface on the jaw body, particularly at the corners of the plates. As a result of this irregular wear, when the liner plates have become worn and it is desired to replace them with new plates, the plane rear surfaces of the new plates, which have been machined to fit flat seats on the jaw body, will not fit the irregular surf-aces resulting from the wearing action of loose plates. The lack of agood fit between the rear faces of the new plates and their worn seats on the jaw body may make it diflicult to securely fasten the liner plates on the jaw body to obtain the desired rigid jaw structure. The interposition of the flat wear plates ll, 22 and 23 between theliner plates I3, 26 and 2! and the mounting faces 1 and 9 on the Jaw-bodies 2 and3 provides a renewable seat on the jaw body to take any wear due to loose liner plates that may occur. during operation of the crusher. The wear plates I l, 22 and. 23 m y be replaced whenever new liner plates are installed on the crusher, creating a fresh and perfect seat for the plane rear faces of the new liner plates. It will be noted that the liner plates [3 0f the swinging jaw are interchangeable so that if one liner plate wears faster than the other they may be reversed to increase the wearing life of the jaw liner., If the liner plates of the stationary jaw are made identical instead of curved as shown in the drawing, they may also be reversed to increase the life of the liner. It will be noted that an oblique walled recess adjoins at least one liner plate bolt hole in the body of each liner plate, providing an oblique walled recess in the liner plates opening to the working face through the bolt hole and recess I9. This oblique walled recess is provided to facilitate the handling of' the liner plates when they must be removed or replaced. As shown in Fig. 1, one of the bolts l! which hold the upper liner plates 26 on the stationary jaw is shown removed. The recess 2| adjoining the bolt hole in the body of liner plate 26 is made in such rela-r' tion 'to the counter recess IS in the Working face 14 that a clear opening having an obliquely upfwardly extending upper wall is formed. This oblique wall forms a good holdfor the tip of a hook 29 which maybe inserted therein for at,- taching lifting gear. the remaining bolts ll may be removed fromthe liner plate and the linerplate may be readily hoisted away from the jaw. Without thepro; vision of this hold for the lifting hook 29, which is protected during operation of the crusher ibyfore always readily available and protected by thebolt head l8 from abnormal wear or filling upby crushed material during crusheroperation. It will be understood that thespecific device described herein and illustrated in the drawing is exemplary only, and that the invention is intended to include. such modifications and equivalents as may readilyoccur to persons skilled in the art, the invention being limited only by the terms of the appended claims,

It is claimed and desired to secure by-Letters Patent:

1. In a crusher jaw, a jaw body having aface, an abutment projecting from said face, a flat wear plate of greater thickness than the depth of said abutment resting against said face and engaging said abutment alongone edge surface, a jaw plate having a working face and a plane rear face fitting said'flat wearplate, *a'ledgeof less depth than the thickness of said wear, plate projecting from the rear face of saidjaw plate for engaging an edge surface of said wear plate opposite said abutment engaging edge .surface in the same interfacial plane, and means to clamp said jaw plate against said wear plate and jaw body to form an operative unit.

2. In a crusher-j aw structure, a jaw body having a pressure receiving face, apair of replaceable wear plates rigidly secured to said body in pressure transmitting relation to said face in longi: tudinally spaced relation,to form a wear. receiving jaw platemounting surface for said jaw body having a transverse groove intermediate. its length, a pair of interchangeable jaw plates for i said jaw each having a working face, area'r' face and a transverse ledge projecting fromone'end With the hook 29 in place,

of said rear face, of depth less than said groove and thickness approximately half the width of said groove, said jaw plates being mounted on said jaw plate mounting surface with their ledge ends abutting and the ledges engaged in said groove to prevent longitudinal displacement of said jaw plates, and means seeming said jaw plates firmly against said jaw plate mounting surface and said jaw body to form an operative unit.

3. In a jaw crusher, a jaw body having a pressure receiving face, a pair of detachable flat wear plates rigidly secured to said body in pressure transmitting relation to said pressure receiving face and longitudinally spaced to form an interrupted jaw liner mounting seat, a jaw liner for said jaw body having a working surface and a rear face, a transverse projecting ledge on said rear face intermediate the ends of said rear face, and means securing said jaw liner against said mounting seat in pressure transmittin relation, with said ledge engaging one of the opposed edge surfaces of said wear plates to fix the longitudinal position of said liner, said jaw body being free of projections obstructing longitudinal expansion of said liner in working.

4. In a crusher jaw structure, a jaw body having a pressure receiving face, a pair of replaceable wear plates rigidly secured to said body in pressure transmitting relation to said face in longitudinally spaced relation, to form a wear receiving jaw plate mounting surface for said jaw body having a transverse groove intermediate its length, a pair of jaw plates for said jaw each having a working face, a rear face and a trans- 6 verse ledge projecting from one end of said reai face, of depth less than said groove and thickness approximately half the width of said groove, said jaw plates being mounted on said jaw plate mounting surface with their ledge ends abutting and the ledges engaged in said groove to prevent longitudinal displacement of said jaw plates, and means securing said jaw plates firmly against said jaw plate mounting surface and said jaw body to form an operative unit.

ALEXANDER J. ROUBAL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 304,537 Walter Sept. 2, 1884 908,592 Michaelsen Jan. 5,1909 945,372 Brinton Jan. 4, 1910 1,079,657 McLean Nov.25, 1913 1,507,661 Buchanan Sept. 9, 1924 1,587,085 Rogers June 1, 1926 1 1,987,360 Buchanan -1 Jan. 8, 1935 FOREIGN PATENTS Number Country Date 776,752 France Nov. 8, 1934 r 555,352 Germany July 22, 1932 2,232 Great Britain 1878 18,492 Great Britain 1906 19,992 Great Britain 1906 21,664 Great Britain 1907 

